Change Stats Not Selectable for Statistics Graph

Why is it that Change cannot be selected on some Statistics Graph cards? Mean, Min and Max are selectable, but not Sum, State or Change.

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I would like to know too, I was able to make a custom sensor and show the Mean, Min and Max, but not the change. I was hoping to use the custom sensor that I converted CuFt to gallons and then see the change in gallons per time period.

Same question here.